Perspectives

(092112)

Extinction
and Time

Questions:

How
massive are the losses for some of the more dramatic extinction events?

How
does life respond to such events?

Is
it reasonable to expect that the Darwinian form of evolution 'replaces' species
after each event?

Is there enough time
to explain life's reemergence through evolution?

Short
Answer:

This portion
of the 'Window' has yet to be filled in. So, this is in part a place
holder for a more comprehensive
treatment of this topic. Yet, we did not want to leave the topic unaddressed.

The
questions above are important and science is today still learning more about
the causes of massive extinction events that appear at several points in geologic
time. A comet or asteroid hitting the earth is the specific causes for at
least one of these events. This is something science has documented and the
larger extinction events is associated with a very large object impacting
the earth.

The planet
is marked by numerous craters and there is even some concern today for the
potential of a large impact to occur sometime in the future. What has stopped
out planet from being continually bombarded is the powerful gravitational
attraction of Jupiter. You might think of this larger planetary cousin as
the 'great attractor' that serves to sweep up many of the meteorites or asteroids
that might otherwise be earth bound.

Yet, impacts
have occurred and the fossil record provides evidence for massive losses of
life. What is a most important point is how extinction events put
a wrinkle in the standard evolution story. Remarkably, the return of life
to the planet after the larger events seems nearly instantaneous in geologic terms. Within thousands of years dinosaurs reappear after an earlier event. The types or kinds differ from what was on Earth before the extinction event. Also, remarkably, the new set of species is well suited for the earthen conditions they inherit.

In short, Darwinian evolution cannot account for the rapid reappearance of these animals. This point is glossed over in many places, books, museums, etc., leaving us to note that the assumption of evolution is strong and unjustified.

But even then,
natural rates or current rates of extinction do not seem to be paralleled
by increases in numbers of species, even without the catastrophic events that
we'll consider here.

Keep the
questions above in mind as you work through the science area. They are important
to building the overall larger picture.

Consider This :

We know of multiple extinctions of life, dinosaurs more than once, where life reappears in the blink of geological time. As a scientist sitting among scientists, might one wonder why the question is not addressed head on: "Where is the time in ten thousand years to evolve all the new dinosaurs?" And yet twice it appears to have happened that rapidly. Well?

And while many turn a blind eye to the appearance of life with the Cambrian explosion, few outwardly recognize that flowering plants appear in the fossil record with only a faint whisper for a predecessor. A wide diversity of flowering plants comes in relatively rapid order. Any antecedent found to date is again little evidence for a diverse horizon of life appearing with little connection to the past.

Added
Perspective:

Too often we hear that in time the data will come to fill the gap. And it is an argument from ignorance to say the explanation will come. We have arrived at a time when better explanations are already here. Logic and historical evidence that is already in hand tell us that waiting is a hope that chance events will explain life. And yet the specificity demonstrated by the Cambrian fauna and the Angiosperms, flowering plants, that arrived later on say that events brining huge amounts of biological information arrived in a drop in place fashion. An intelligence can see that it takes an intelligence to produce and coordinate the appearances of this biological form in the time frames we know transpired here on earth.

The WindowView section on Change considers that one of today's largest global phenomena is extinction of species. Changes on earth today are driving many species out of existence. The fact that this is not an instantaneous impact event means we are watching a slow motion removal of life. The net effect is the same, species are going and diversity of life is dropping right before our eyes.

(090109)

For a general listing of books, visit the WindowView Book Page for: Science and Scripture .

References of Interest

Step Up To Life

Time spent looking ... through a window on life and choice ... brings the opportunity to see in a new light. The offer for you to Step Up To Life is presented on many of the web pages at WindowView. Without further explanation we offer you the steps here ... knowing that depending on what you have seen or may yet explore in the window ... these steps will be the most important of your life ...